Ubergeek63
Well-Known Member
To Ubergeeks63 : I am using PIC16 because I had other thing to add on in the future work. Such as MPPT for solar system. therefore, I need PIC16 with I/O ports to measure input current, input voltage, output voltage and output current to perform MPPT.
I am wondering what is the rating for Rg. 5-10ohms with 0.25W??or higher??
i see... well i am going to tell you what i keep telling my boss to tell our customers: stop asking about your latest issue and tell us what you are trying to accomplish!
what you have then is a 100W 12V solar panel that you want to charge a 24V lead acid pack with ...
a typical solar panel puts out about 8A@12V and about 7A@17V, so a 250uH 10A inductor @100KHz is all you need and is within the capability of the PIC... it is still a crappy overpriced part for the job but it comes in a standard DIP package that you can handle.
you do NOT need a voltage measurement or multiply operation to do the MPPT since the battery is a relatively constant voltage, all you need is the charge current.
you DO need the battery voltage for the charge algorithm though.
dan